Agilent N5181A/82A MXG Signal Generators SCPI Command Reference 143
Component Test Digital Commands
Dual ARB Subsystem–Option 651/652/654 ([:SOURce]:RADio[1]:ARB)
Key Entry Clear Header
Remarks A waveform must be selected for this command to function.
:HEADER:NOISe:RMS[:OVERride]
Supported N5182A with Option 651/652/654
[:SOURce]:RADio[1]:ARB:HEADER:NOISe:RMS:OVERride "<file_name>",<value>|UNSPecified
[:SOURce]:RADio[1]:ARB:HEADER:NOISe:RMS:OVERride? "<file_name>"
This command sets the value of the waveform’s I and Q RMS (root mean square) for noise.
The RMS is used strictly for calculating the relative power of the noise in the currently displayed
header. The RMS is specified in normalized linear units with |+1| or |–1| as full scale on I or Q,
therefore the largest RMS that can be specified is the square root of 2 (1.414213562). If the value is
unspecified, then the waveform file header’s RMS is used.
This value is useful if you wish to have the noise be relative to only a portion of the waveform, such
as a pilot channel, or be relative to only a single carrier that is mixed with other carriers.
For setting the header’s RMS value, see “:HEADer:RMS” on page 143.
"<file_name>" This variable names the waveform file to which the RMS value will be applied.
The file name variable can designate a file in the WFM1, NVWFM, or SEQ
directories. For information on the file name syntax, refer to “File Name
Variables” on page 12.
<value> This variable is the user- measured RMS noise value for the specified carrier.
UNSPecified Sets RMS as unspecified, which causes the general RMS value to be used for
calculating the relative noise power.
Example
:RAD:ARB:HEADER:NOISe:RMS:OVER "WFM1:Sine_Wave",.835
The preceding example sets the file header RMS noise override value for a file type WFM1, named
Sine_Wave, to .835.
:RAD:ARB:HEADER:NOISe:RMS:OVER "WFM1:Sine_Wave",UNSP
In the second example, the signal generator calculates the RMS, using the waveform file header’s RMS
value. For setting the header’s RMS value, see “:HEADer:RMS” on page 143.
The RMS value is expressed in volts.
:HEADer:RMS
Supported N5182A with Option 651/652/654
[:SOURce]:RADio[1]:ARB:HEADER:RMS "<file_name>",<value>|UNSPecified
[:SOURce]:RADio[1]:ARB:HEADER:RMS? "<file_name>"
This command sets the file header RMS value for the selected waveform file. The Agilent MXG uses
the RMS value with the dual ARB’s real- time noise function and to optimize the modulator drive
level.
Key Entry Edit Noise RMS Overide Unspecified Enter
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